We already have a small draft PR for this 
I think from Zee and Jennifer.
Looking at it I realize my comments may not be correct, which could be good news!
I am no longer sure that we need to refactor the option_value_namer for this.
This change could be made in a parallel to the option_value_namer problem and so, be made without the refactoring I mentioned above.
Now I am thinking that adding a few things (the units!) here and there in the code and some nice automated tests can actually get this feature to done. Let’s see what our dear new friends can get to!